Uburemere bwa sodium carboxymethyl cellulose nabwo bugabanyijemo ibyiciro byinshi bitewe n'ikoreshwa ryayo. Uburemere bw'ubwoko bwo gukaraba ni 10 ~ 70 (munsi ya 100), uburemere bwo hejuru ni kuva kuri 200 ~ 1200 mu mitako y'inyubako n'izindi nganda, kandi uburemere bw'ibiribwa buri hejuru kurushaho. Byose biri hejuru ya 1000, kandi uburemere bw'inganda zitandukanye ntabwo ari bumwe.
Kubera uburyo bwinshi ikoreshwamo.
Uburemere bwa sodium carboxymethyl cellulose buterwa n'uburemere bwayo bwa molekile, ingano yayo, ubushyuhe n'agaciro ka pH, kandi ivangwa na ethyl cyangwa carboxypropyl cellulose, gelatin, xanthan gum, carrageenan, locustbean gum, guar gum, agar, sodium alginate, pectin, gum arabic na starch kandi ibikomoka kuri yo bifite imikoranire myiza (ni ukuvuga ingaruka za synergistic).
Iyo pH ifite agaciro ka 7, ubukana bwa sodium carboxymethyl cellulose ni bwo buri hejuru cyane, kandi iyo pH ifite agaciro ka 4 ~ 11, iba ihamye. Carboxymethylcellulose mu buryo bwa alkali metal na ammonium salts irashonga mu mazi. Ion z'icyuma zivanze Ca2+, Mg2+, Fe2+ zishobora kugira ingaruka ku bukana bwazo. Ibyuma bikomeye nka feza, barium, chromium cyangwa Fe3+ bishobora gutuma bisohoka mu bukana bwazo. Iyo ubukana bwa ions bugenzuwe, nko kongeramo aside citric agent, umuti urushaho gukomera ushobora gukorwa, bigatuma habaho gum yoroshye cyangwa ikomeye.
Selulosi ya sodium carboxymethyl ni ubwoko bwa selulosi karemano, muri rusange ikorwa mu ipamba cyangwa mu giti nk'ibikoresho fatizo kandi igaterwa na aside monochloroacetic mu gihe cy'imiterere ya alkaline.
Dukurikije ibipimo by'ibikoresho fatizo n'uburyo hifashishijwe hydroxyl hydrogen mu gice cya selulosi D-glucose n'itsinda rya karuboksimetili, haboneka imvange za polymeri zishonga mu mazi zifite urwego rutandukanye rwo gusimbuza hamwe n'ibipimo bitandukanye by'uburemere bwa molekile.
Kubera ko cellulose ya sodium carboxymethyl ifite imiterere myinshi yihariye kandi myiza, ikoreshwa cyane mu nganda za buri munsi z’ibinyabutabire, mu biribwa no mu buvuzi ndetse no mu zindi nganda.
Kimwe mu bimenyetso by'ingenzi bya selulosi ya sodium carboxymethyl ni ubukana bwa selulosi ya sodium carboxymethyl. Agaciro k'ubukana gafitanye isano n'ibintu bitandukanye nko kuba ikigero, ubushyuhe n'umuvuduko wo gukata. Ariko, ibintu nk'ubukana, ubushyuhe n'umuvuduko wo gukata ni ibintu byo hanze bigira ingaruka ku bukana bwa selulosi ya sodium carboxymethyl.
Uburemere bwa molekile n'ikwirakwizwa rya molekile ni ibintu by'imbere bigira ingaruka ku bucucike bwa sodium carboxymethyl cellulose. Kugira ngo hagenzurwe umusaruro wa sodium carboxymethyl cellulose kandi hakorwe neza imikorere yayo, ubushakashatsi ku buremere bwa molekile n'ikwirakwizwa ryayo bifite agaciro gakomeye cyane, mu gihe ubucucike bushobora kugira uruhare runaka gusa.
Amategeko ya Newton muri rheology, nyamuneka soma ibikubiye muri "rheology" muri shimi y'umubiri, biragoye kubisobanura mu nteruro imwe cyangwa ebyiri. Niba ugomba kubivuga: ku gisubizo cya cmc givanze hafi y'amazi ya Newtonian, stress yo gukata ingana n'igipimo cyo guca, kandi igipimo hagati yabyo cyitwa coefficient ya viscosity cyangwa kinematic viscosity.
Ubucucike bukomoka ku mbaraga ziri hagati y’iminyururu ya molekile ya selulosi, harimo imbaraga zo gutatana n’iminyururu ya hydrogen. By’umwihariko, polimerasiyo y’ibikomoka kuri selulosi si imiterere igororotse ahubwo ni imiterere ifite amashami menshi. Mu gisubizo, selulosi nyinshi zifite amashami menshi zihuzwa kugira ngo zikore imiterere y’urusobe rw’ahantu. Uko imiterere irushaho kuba ikomeye, ni ko imbaraga ziri hagati y’iminyururu ya molekile mu gisubizo gikomokaho ziba nyinshi.
Kugira ngo habeho urujya n'uruza mu gisubizo cya dilutive derivatives za cellulose, imbaraga ziri hagati y'iminyururu ya molekile zigomba kurenga, bityo igisubizo gifite urwego rwo hejuru rwa polymerization gisaba imbaraga nyinshi kugira ngo kibeho urujya n'uruza. Ku gupima viscosity, imbaraga ziri kuri CMC solution ni gravity. Mu gihe cy'uburemere buhoraho, imiterere y'uruhererekane rw'igisubizo cya CMC gifite urugero runini rwa polymerization igira imbaraga nyinshi, kandi urujya n'uruza ruragenda buhoro. Urujya n'uruza ruragenda buhoro rugaragaza viscosity.
Uburemere bwa sodium carboxymethyl cellulose bushingiye ahanini ku buremere bwa molekile, kandi ntaho buhuriye n'urwego rwo gusimbuza. Uko urugero rwo gusimbuza rurushaho kuba rwinshi, ni ko uburemere bwa molekile buba bwinshi, kuko uburemere bwa molekile bw'itsinda rya carboxymethyl ryasimbuwe buba bunini kurusha itsinda rya hydroxyl ryabanje.
Umunyu wa sodium wa cellulose carboxymethyl ether, ether ya cellulose anionic, ni ifu y'umweru cyangwa ifu y'umweru ifite umunyu cyangwa granule, ifite ubucucike bwa 0.5-0.7 g / cm3, hafi ya yose nta mpumuro, nta buryohe, kandi nta hygroscopic. Biroroshye gukwirakwira mu mazi kugira ngo habeho umuti wa colloidal ubonerana, kandi ntushongeshwa n'ibintu bishongesha nk'amavuta nka ethanol. pH y'umuti wa 1% w'amazi ni 6.5 kugeza 8.5. Iyo pH iri hejuru ya 10 cyangwa <5, ubukana bwa sodium carboxymethylcellulose buragabanuka cyane, kandi umusaruro uba mwiza iyo pH = 7.
Irahindagurika mu bushyuhe. Ubushyuhe buzamuka vuba cyane munsi ya 20°C, kandi buhinduka buhoro buhoro kuri 45°C. Gushyushya igihe kirekire hejuru ya 80°C bishobora kwangiza colloid no kugabanya ubushyuhe n'imikorere yayo cyane. Irashonga byoroshye mu mazi, kandi umuti uba ubonerana; irahindagurika cyane mu muti wa alkaline, kandi biroroshye kuyihinduramo amazi iyo hari aside. Iyo pH iri hagati ya 2-3, iragabanuka.
Igihe cyo kohereza: Ugushyingo-07-2022